VPN - basic knowledge / info about typical VPN configuration

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http://www.linuxquestions.org – Hi Gurus, in my network all of my servers based on RedHat 5 and Centos 5. Right now my boss told me that I have to connect two offices in two diffrent countries using VPN: Office Berlin and Office Hamburg. In both offices we have huge local networks but in Office Berlin we have more services like (FileServer (samba), Database(oracle), some groupware).Lets say that Berlin is headquater. How should I configure the VPN that people from both offices would be visible in LAN ? Is it possible ? What kind of server / clients should I use ?< (HowTos)